Great story from the memoirs of William Moore, an Electrical Systems expert for the Apollo program in the 1960s. Moore writes about the time that he and his team had to take a trip out to the launchpad to fix something on the first unmanned launch of the Saturn V rocket.
Our goal was to enter this two level hermetically sealed, all welded steel coffin called the Mobil Launcher Base topped by a fully loaded 363 ft. high Saturn V, weighing 6.2 million pounds, and the permanently attached 380 ft. high Umbilical Tower, weighing 500k pounds. We finally stopped and left our van to walk up and into the second level of the Mobile Launcher Base. About this time, it came to my mind that during one of our training sessions we were told that one of the fully fueled prototype S11 rocket stages had been exploded out in the desert. The results showed that all buildings better be at least three miles from the launch lads — which they are. We were now within 25 feet of this 363ft tall bomb that sounded like it’s giant fuse had been lit, and we were soon going to get much closer.
(via hacker news)